Watch object changes

gistfile1.txt

let j = {
    a: 1
};

// Upon change, save to server
let changeable = onChange(j, () => save(j));

// Make a change that would trigger changes
changeable.a = 2;

// save() is triggered!

// j.a === 2;

onChange proxy

'use strict';

module.exports = (object, onChange) => {
        const handler = {
                get(target, property, receiver) {
                        try {
                                return new Proxy(target[property], handler);
                        } catch (err) {
                                return Reflect.get(target, property, receiver);
                        }
                },
                defineProperty(target, property, descriptor) {
                        onChange();
                        return Reflect.defineProperty(target, property, descriptor);
                },
                deleteProperty(target, property) {
                        onChange();
                        return Reflect.deleteProperty(target, property);
                }
        };

        return new Proxy(object, handler);
};